Correlation between Diurnal Variation of Photosynthesis and Environmental Factors in Different Fresh-eating Jujube Varieties in Yulin Area
To investigate the variations in photosynthetic characteristics among different introduced fresh-eating jujube varieties in Yulin,Shaanxi Province,analyze the diurnal variation of photosynthesis among these varieties and examine their correlation with other factors,this study seeks to identify and recommend local fresh-eating jujube varieties.The goal is to provide a reference for the application of excellent fresh-eating jujube varieties.The GFS-3000 instrument was used in this experiment to measure the diurnal variation of photosyn-thesis in four different fresh-eating jujube varieties(Puyangtang jujube,Lengbaiyu jujube,Zaocuimi jujube,Jin'ai No.4 jujube)under the natural conditions of the sandy land in Yulin,Shaanxi Province.The relationship between various physiological,ecological factors and diurnal variation of photosynthesis was analyzed.The daily average value of net photosynthetic rate followed the order of Puyangtang jujube>Lengbaiyu jujube>Jin'ai 4 ju-jube>Zaocuimi jujube;The daily average transpiration rates were as follows:Jin'ai 4 jujube>Zaocuimi jujube>Lengbaiyu jujube>Puyang Tangzao jujube;The net photosynthetic rate(Pn)of four fresh-eating jujube had double peaks,with the two peaks for all four varieties occurring at 9:00 and 15:00;Influenced by different physiological and ecological factors,Pn for each variety showed a significant correlation with photosynthetic effec-tive radiation(PAR),transpiration rate(Tr),and relative humidity(RH)(P<0.01)or a significant correla-tion at the 5%level(P<0.05).Intercellular carbon dioxide(Ci)was found to be significantly negatively corre-lated(P<0.01).Among the four fresh-eating jujube varieties,Puyangtang jujube and Lengbaiyu are more suitable for planting in Yulin sandy land.
Fresh-eating jujubeVarietiesPhotosynthetic characteristicsPhysiological and ecological factors
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NSTL
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